Low-carbon equivalent high strength and toughness cast steel
A high-strength toughness, carbon equivalent technology, applied in the field of low-alloy steel material casting, can solve the problems of inability to balance welding performance and strength indicators, and achieve the effect of improving material strength and low-temperature toughness
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[0031] Example 1
[0032] A low carbon equivalent high strength and toughness cast steel, its preparation method includes the following smelting, pouring and heat treatment, and its specific process flow and process parameters are:
[0033] (1) Smelting process
[0034] Smelt in a 7-ton electric arc furnace, select dry, oil-free and less rusty Q235 steel plate (Cr0.28%, Cu0.06%) scrap 6500Kg for smelting. When the scrap steel is melted and the temperature is 1541℃, sample No. 1 , Measured C0.55%, Ni0.25%, Mo0.08%, P0.037%. Add 35Kg of electrolytic nickel, 23Kg of FeMo60-A molybdenum-iron alloy, and then blow oxygen to decarburize. During the decarburization process, the slag is continuously released and new slag is produced. Observe the flame and furnace atmosphere. Take sample No. 2 (C0.31%, Ni0.79%) , Mo0.27%, P0.009%). When the temperature is 1595℃, add FeSi75Al0.5-A ferrosilicon 20Kg alloy for pre-reduction, continue to heat up, when the temperature reaches 1680℃, remove clean...
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[0043] Example 2
[0044] A low carbon equivalent high strength and toughness cast steel, its preparation method includes the following smelting, pouring and heat treatment, and its specific process flow and process parameters are:
[0045] (1) Smelting process
[0046] Smelt in a 7-ton electric arc furnace, select dry, oil-free and rust-free Q235 steel plate (Cr0.28%, Cu0.07%) scrap 6500Kg for smelting. When the scrap steel is melted and the temperature is 1534℃, sample No. 1 is taken , Measured C0.56%, Ni0.14%, Mo0.04%, P0.033%. Add 46Kg of electrolytic nickel plate and 24Kg of FeMo60-A molybdenum-iron alloy, and then blow oxygen to decarburize. During the decarburization process, slag is continuously released and new slag is produced. Observe the flame and furnace atmosphere. Take sample No. 2 and measure C0.35%, Ni0 .80%, Mo0.24%, P0.007%. When the temperature is 1600℃, add FeSi75Al0.5-A ferrosilicon alloy 20Kg for pre-reduction, and continue to heat up. When the temperature r...
Example Embodiment
[0055] Example 3
[0056] A low carbon equivalent high strength and toughness cast steel, its preparation method includes the following smelting, pouring and heat treatment, and its specific process flow and process parameters are:
[0057] (1) Smelting process
[0058] Smelting in a 7-ton electric arc furnace, selecting dry, oil-free and rust-free Q235 steel plate (Cr0.28%, Cu0.06%) scrap 6500Kg for smelting, when the scrap steel is melted and the temperature is 1545℃, sample No. 1 , Measured C0.56%, Ni0.13%, Mo0.06%, P0.029%. Add 42Kg of electrolytic nickel and 23Kg of FeMo60-A molybdenum-iron alloy, and then blow oxygen to decarburize. During the decarburization process, the slag is continuously released and new slag is produced. Observe the flame and furnace atmosphere. Take sample No. 2 (C0.29%, Ni0.79%) , Mo0.26%, P0.005%). When the temperature is 1603℃, add FeSi75Al0.5-A ferrosilicon 20Kg alloy for pre-reduction, and continue to heat up. When the temperature reaches 1695℃, ...
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